install the package error

[scorpionfeng]

1. when I execute the command pip install -r requirements.txt then show the error infomation : "This backport is for Python 2.7 only"
2. cann't find the requirements package and show the error message : Could not find a version that satisfies the requirement adium-theme-ubuntu==0.3.4 (from -r requirements.txt (line 1)) (from versions: none)